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Wa3pxx - CC BY-SA 3.0
Piotr Drabik - CC BY 2.0
Bachrach - Public Domain
M. Golde - Public Domain
Stellaharpley - CC BY-SA 3.0
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
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G103317 - CC BY-SA 3.0
Craig - Painter - Public Domain
Andy Newcombe - CC BY 2.0
Smithsonian Institution; credited to Langley himself by their archive. - Public Domain
Eric Staller - CC BY-SA 4.0
unknown - Public Domain
Romanpoet - Public Domain
unknown -
GiraldiMedia - CC BY-SA 4.0
Kingkongphoto & www.celebrity-photos.com - CC BY-SA 2.0
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Wa3pxx - CC BY-SA 3.0
Pullen, Thomas G. (Thomas Granville), 1898-1979
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Piotr Drabik - CC BY 2.0
Weir, Peter, 1944-....
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Ranke, Leopold von 1795-1886
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Fleming, William H. (William Henry), 1856-1944
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Bachrach - Public Domain
Phillips, Duncan
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Colvin, Verplanck, 1847-1920
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M. Golde - Public Domain
Spindler, Fritz, 1817-1905
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Stellaharpley - CC BY-SA 3.0
Gerhardie, William Alexander, 1895-1977
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Crowder, E. H. (Enoch Herbert), 1859-1932
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Digges, Dudley, 1879-1947
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Bury, Pol, 1922-2005
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Zhou, Yang, 1908-1989
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Brady-Handy Photograph Collection (Library of Congress) - Public Domain
Train, Charles Russell, 1817-1885
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Townsend, John, Sir, 1868-1957
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G103317 - CC BY-SA 3.0
Hirsch, Max, 1853-1909
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Craig - Painter - Public Domain
Bridgewater, Francis Egerton, Duke of, 1736-1803
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Andy Newcombe - CC BY 2.0
Flynt, Henry
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Smithsonian Institution; credited to Langley himself by their archive. - Public Domain
Langley, S. P. (Samuel Pierpont), 1834-1906
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Eric Staller - CC BY-SA 4.0
Staller, Eric, 1947-....
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unknown - Public Domain
Stein, Edith, Saint, 1891-1942
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Romanpoet - Public Domain
Koch, Christof, 1956-....
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Kitzhaber, John A. (John Albert), 1947-
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Gracey, Samuel Levis, 1835-1911
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Parise, Goffredo
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Ratzel, Friedrich, 1844-1904?
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Cesare, Oscar Edward, 1885-1948
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Unger, Josef, 1828-1913
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GiraldiMedia - CC BY-SA 4.0
Giraldi, Bob 1939-
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Kingkongphoto & www.celebrity-photos.com - CC BY-SA 2.0
Redstone, Sumner.
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Bullock, Alexander H. (Alexander Hamilton), 1816-1882